The Drilldown: Protesters cut off pipelines in Canada and U.S.

Activists break through security and shut down valves, stemming flow of oil

Kumai Yaqui Chicana speaks to a crowd of people during a rally to show solidarity with the Standing Rock Sioux on Tuesday, Sept. 13, 2016, in Boulder, Colo. The Standing Rock Sioux tribe in North Dakota are protesting a four-state oil pipeline. The tribe says the project will disturb sacred sites and impact drinking water. (Jeremy Papasso/Daily Camera via AP)